Finding the Fourth Proportional to 2,065.99, 3,099.50 and 679.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,065.99 : 3,099.50 = 679.40 : x
2. Step 2: Convert to fraction form
   2,065.99/3,099.50 = 679.40/x
3. Step 3: Cross multiply
   2,065.99x = 3,099.50 × 679.40
4. Step 4: Simplify right side
   2,065.99x = 2,105,800.30
5. Step 5: Solve for x
   x = 2,105,800.30/2,065.99
6. Step 6: Final answer
   x = 1,019.27